scholarly journals Valorization of Oued Sebou Natural Sediments (Fez-Morocco Area) as Adsorbent of Methylene Blue Dye: Kinetic and Thermodynamic Study

2020 ◽  
Vol 2020 ◽  
pp. 1-8 ◽  
Author(s):  
Abdelaziz Dra ◽  
Karim Tanji ◽  
Abdellah Arrahli ◽  
El Mustafa Iboustaten ◽  
Abdelali El Gaidoumi ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Particle Diameter ◽  
Reaction Medium ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Solution Ph ◽  
Carboxyl Functional Group ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Mb Adsorption

The objective of this study is to evaluate the efficiency of methylene blue removal using Oued Sebou sediments as an adsorbent. The presence of carboxyl functional group demonstrated by infrared (IR) analysis of the sediment favorized the methylene blue (MB) adsorption. Sediment collected from Oued Sebou could remove the most MB molecules at pH 8. The Freundlich model described suitably the adsorption process. The experimental measured enthalpy (ΔH) and entropy (ΔS°) are 118.1 kJ mol−1 and 395.2 J mol−1 K−1, respectively, indicating that the reaction was endothermic with an increase of randomness at the solid/liquid interface during the adsorption. The kinetics of MB adsorption by sediment were adequately fitted to the pseudo-second-order model. Experimental results showed that the adsorption capacity of the methylene blue dye depends on the solution pH, the initial dye concentration, the adsorbent mass, the sediment particle diameter, and the temperature of the reaction medium. The removal efficiency of the MB molecules reaches 100% after 60 minutes under the optimum conditions.

scholarly journals Sorption of Chromium(VI), Cadmium(II) Ions and Methylene Blue Dye by Pristine, Defatted and Carbonized Nigella sativa L. Seeds from Aqueous Solution

2021 ◽  
Vol 33 (2) ◽  
pp. 471-483
Author(s):  
Patience Mapule Thabede ◽  
Ntaote David Shooto ◽  
Eliazer Bobby Naidoo
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Nigella Sativa ◽  
Physical Adsorption ◽  
Blue Dye ◽  
Order Kinetic ◽  
Methylene Blue Dye ◽  
Solution Ph ◽  
Sem Images ◽  
Chromium Vi

Present study reports on the sorption study of chromium(VI), cadmium(II) ions and methylene blue dye by pristine, defatted and carbonized Nigella sativa L. seeds from aqueous solution. The removal of oil from pristine Nigella sativa L. (PNS) seeds was carried out by defatting the Nigella sativa with acetone and N,N-dimethylformamide and then labelled ANS and DNS, respectively. Thereafter the defatted ANS and DNS adsorbents were carbonized at 600 ºC for 2 h under nitrogen and labelled as CANS and CDNS. The results of pristine, defatted and carbonized seeds were compared. The removal of Cr(VI), Cd(II) and methylene blue dye from aqueous solutions was investigated by varying adsorbate concentration, solution pH, reaction contact time and temperature of the solution. The SEM images indicated that the surface morphology of PNS was irregular, whilst ANS and DNS had pores and cavities. CANS and CDNS was heterogeneous and had pores and cavities. FTIR spectroscopy showed that the adsorbents surfaces had bands that indicated a lot of oxygen containing groups. The pH of the solution had an influence on the removal uptake of Cr(VI), Cd(II) and methylene blue. The sorption of Cr(VI) decreased when pH of the solution was increased due to different speciation of Cr(VI) ions whilst the removal of Cd(II) and methylene blue increased when solution pH was increased. Pseudo first order kinetic model well described the adsorption of Cr(VI), Cd(II) and methylene blue onto PNS. On the other hand, the kinetic data for ANS, CANS, DNS and CDNS was well described by pseudo second order. Furthermore, the removal mechanism onto PNS and ANS was better described by Freundlich multilayer model. The CANS, DNS and CDNS fitted Langmuir monolayer model. Thermodynamic parameters indicated that the sorption processes of Cr(VI), Cd(II) and methylene blue was endothermic and effective at high temperatures for all adsorbents. The ΔSº and ΔHº had positive values this confirmed that the sorption of Cr(VI), Cd(II) and methylene blue onto all adsorbents was random and endothermic, respectively. The values of ΔGº confirmed that the sorption of Cr(VI), Cd(II) and methylene blue on all adsorbents was spontaneous and predominated by physical adsorption process. The CANS had highest adsorption capacity of 99.82 mg/g for methylene blue, 96.89 mg/g for Cd(II) and 87.44 mg/g for Cr(VI) followed by CDNS with 93.90, 73.91 and 65.38 mg/g for methylene blue, Cd(II) and Cr(VI), respectively. The ANS capacities were 58.44, 45.28 and 48.96 mg/g whilst DNS capacities were 48.19, 32.69 and 34.65 mg/g for methylene blue, Cd(II) and Cr(VI), respectively. PNS had the lowest sorption capacities at 43.88, 36.01 and 19.84 mg/g for methylene blue, Cd(II) and Cr(VI), respectively.

VO2(D) hollow core–shell microspheres: synthesis, methylene blue dye adsorption and their transformation into C/VOxnanoparticles

2018 ◽  
Vol 5 (3) ◽  
pp. 550-558 ◽  
Author(s):  
Liangmiao Zhang ◽  
Jianing Yao ◽  
Fang Xia ◽  
Yunfeng Guo ◽  
Chuanxiang Cao ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Dye Adsorption ◽  
Blue Dye ◽  
Core Shell ◽  
Methylene Blue Dye ◽  
Hollow Core ◽  
Adsorption Ability ◽  
Adsorption Performance ◽  
Enhanced Adsorption ◽  
Mb Adsorption

Hollow core–shell VO2(D) microspheres were fabricated and they exhibited excellent MB adsorption ability; and the regenerated C/VOxnanoparticles showed enhanced adsorption performance and good reusability.

scholarly journals Removal of methylene blue from aqueous solution by ozone microbubbles

2020 ◽  
Vol 27 (3) ◽  
pp. 31-40
Author(s):  
Ola A. Nashmi ◽  
Nada N. Abdulrazzaq ◽  
Ahmed A. Mohammed
Keyword(s):  
Methylene Blue ◽  
Removal Efficiency ◽  
Batch Reactor ◽  
Generation Rate ◽  
Blue Dye ◽  
Order Kinetic ◽  
Methylene Blue Dye ◽  
Solution Ph ◽  
Ozone Generation ◽  
Order Kinetic Model

In this work, ozone microbubbles (OMBs) technique was used to remove methylene blue dye (MB) from water in a semi- batch reactor. The removal efficiency of methylene blue dye were investigated under various reaction conditions such as effect of initial solution pH, ozone generation rate, initial methylene blue dye concentration and determination of mass transfer coefficient. The removal of methylene blue by Ozonation microbubbles were very high at the acidic media and upon increasing ozone generation rate from 0.498 to 0.83 mg s−1, the removal efficiency dramatically increased from 8 to 98%.The overall rate of the oxidation reaction fitted well a second order kinetic model. The results demonstrated that ozone microbubbles were effective in terms of the elimination of methylene blue concentration and its complete mineralization.

scholarly journals Evaluation of Methylene Blue Sorption onto Low-Cost Biosorbents: Equilibrium, Kinetics, and Thermodynamics

2020 ◽  
Vol 2020 ◽  
pp. 1-11 ◽  
Author(s):  
Rekha Singh ◽  
Tony S. Singh ◽  
John O. Odiyo ◽  
James A. Smith ◽  
Joshua N. Edokpayi
Keyword(s):  
Methylene Blue ◽  
Particle Size ◽  
Ginkgo Biloba ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Order Model ◽  
Solution Ph

This paper presents a study on batch sorption of methylene blue dye from aqueous solution onto Ginkgo biloba sorbent, a waste material produced during the Fall season in many parts of the world. Batch kinetics, equilibrium, and thermodynamic studies were conducted to evaluate the effect of contact time (0–150 min), sorbent dose (0.5–3.0 g/L), pH (2–11), temperature (30–50°C), initial MB concentration (10–30 mg/L), and particle size (177 μm—590 μm) on the methylene blue dye sorption. More than 99% removal of methylene blue was observed within 120 minutes. A Lagergren pseudo-first-order model, a pseudo-second-order model, and intraparticle diffusion models fitted well to the kinetics experimental data. Langmuir and Freundlich isotherm models also fitted well with the observed equilibrium data. Additionally, removal of methylene blue increased with increase in solution pH. Higher sorption capacity (∼20 mg/g) was observed with smaller particle size (170 μm) as compared to larger particle sizes (590 μm). Thermodynamic parameters such as ∆G°, ∆H°, and ∆S° indicated that the sorption process was feasible, spontaneous, and endothermic in nature. The study shows that Ginkgo biloba leaves have the potential to be an efficient sorbent for the removal of methylene blue from surface water samples.

scholarly journals Synthesis, Characterization, Photocatalytic Activities and Reusability of Eu-ZnO-Ag Nanoparticles using Sunlight/LEDs Illuminations

2019 ◽  
Vol 31 (4) ◽  
pp. 813-819
Author(s):  
Y. Jerlin Jose ◽  
S. Joseph Selvaraj ◽  
M. Manjunathan
Keyword(s):  
Methylene Blue ◽  
Visible Region ◽  
Solar Light ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Solution Ph ◽  
Excellent Activity ◽  
Ag Catalyst ◽  
Light Absorbance ◽  
The Eu

Photocatalyst (Eu–ZnO–Ag) was synthesized by precipitation-decomposition process. The characterization catalyst by phase and size of catalyst by powder-XRD, morphology of catalyst by FE-SEM and optical properties by UV-visible and emission spectroscopy. The photocatalytic action of Eu–ZnO–Ag was investigated in the photodegradation of methylene blue dye in water under LEDs/ solar light. Eu–ZnO–Ag catalyst is indicating the excellent activity than Ag–ZnO, Eu–ZnO commercial ZnO/TiO2 nanoparticles. Co-dopants (Eu/Ag) shift the light absorbance of ZnO toward visible region. Factor affecting of photodegrdation study by dose, dye, solution pH on of methylene blue dye present solar/LEDs. The Eu–ZnO–Ag is established to be reusable photocatalyst. A potential photodegradation of methylene blue mechanism was discussed under illuminations LEDs/solar light.

scholarly journals Eucheuma cottonii Seaweed-Based Biochar for Adsorption of Methylene Blue Dye

2020 ◽  
Vol 12 (24) ◽  
pp. 10318 ◽  
Author(s):  
Anwar Ameen Hezam Saeed ◽  
Noorfidza Yub Harun ◽  
Suriati Sufian ◽  
Ahmer Ali Siyal ◽  
Muhammad Zulfiqar ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Large Scale ◽  
Synthetic Wastewater ◽  
Blue Dye ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Methylene Blue Dye ◽  
Adsorption Model ◽  
Solution Ph ◽  
Eucheuma Cottonii

Pollution from dye containing wastewater leads to a variety of environmental problems, which can destroy plant life and eco-systems. This study reports development of a seaweed-based biochar as an adsorbent material for efficient adsorption of methylene blue (MB) dye from synthetic wastewater. The Eucheuma cottonii seaweed biochar was developed through pyrolysis using a tube furnace with N2 gas, and the properties were later improved by sulfuric acid treatment. The adsorption studies were conducted in a batch experimental setup under initial methylene blue concentrations of 50 to 200 mg/L, solution pH of 2 to 10, and temperature of 25 to 75 °C. The characterization results show that the developed biochar had a mesoporous pore morphology. The adsorbent possessed the surface area, pore size, and pore volume of 640 m2/g, 2.32 nm, and 0.54 cm3/g, respectively. An adsorption test for 200 mg/L of initial methylene blue at pH 4 showed the best performance. The adsorption data of the seaweed-based biochar followed the Langmuir isotherm adsorption model and the pseudo-second-order kinetic model, with the corresponding R2 of 0.994 and 0.995. The maximum adsorption capacity of methylene blue using the developed seaweed‑based biochar was 133.33 mg/g. The adsorption followed the chemisorption mechanism, which occurred via the formation of a monolayer of methylene blue dye on the seaweed-based biochar surface. The adsorption performance of the produced seaweed biochar is comparable to that of other commercial adsorbents, suggesting its potential for large-scale applications.

Using of modified-bentonite as low-cost sorbent for removal of methylene blue dye from aqueous solution

2020 ◽  
Vol 27 (2) ◽  
pp. 45-54
Author(s):  
Saraa Muwafaq Ibrahim ◽  
Ziad T. Abd Ali
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Silanol Group ◽  
Infrared Spectrometry ◽  
Blue Dye ◽  
Ammonium Bromide ◽  
Vibration Band ◽  
Order Kinetic ◽  
Methylene Blue Dye ◽  
Modified Bentonite

Batch experiments have been studied to remove methylene blue dye (MB) from aqueous solution using modified bentonite. The modified bentonite was synthesized by replacing exchangeable calcium cations in natural bentonite with cationic surfactant cetyl trimethyl ammonium bromide (CTAB). The characteristics of modified bentonite were studied using different analysis such as Scanning electronic microscopy (SEM), Fourier transform infrared spectrometry (FTIR) and surface area. Where SEM shows the natural bentonite has a porous structure, a rough and uneven appearance with scattered and different block structure sizes, while the modified bentonite surface morphology was smooth and supplemented by a limited number of holes. On other hand, (FTIR) analysis that proved NH group aliphatic and aromatic group of MB and silanol group are responsible for the sorption of contaminate. The organic matter peaks at 2848 and 2930 cm-1 in the spectra of modified bentonite which are sharper than those of the natural bentonite were assigned to the CH2 scissor vibration band and the symmetrical CH3 stretching absorption band, respectively, also the 2930 cm-1 peak is assigned to CH stretching band. The batch study was provided the maximum removal efficiency (99.99 % MB) with a sorption capacity of 129.87 mg/g at specified conditions (100 mg/L, 25℃, pH 11 and 250rpm). The sorption isotherm data fitted well with the Freundlich isotherm model. The kinetic studies were revealed that the sorption follows a pseudo-second-order kinetic model which indicates chemisorption between sorbent and sorbate molecules.

Adsorption Studies of Methylene Blue Dye using Biosorbents

2018 ◽  
Vol 8 (3) ◽  
pp. 502-513
Author(s):  
Saravanan Narayanan ◽  
Rathika Govindasamy
Keyword(s):  
Methylene Blue ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Adsorption Studies
Sign in / Sign up

Export Citation Format

Share Document